I have done experiments personally and they are not always sterile. I had crossed 2n and 4n Raddish and got 3n sporophytic stage. Thanks anyways. Pankaj
On Sat, Sep 25, 2010 at 11:29 PM, Gurcharan Singh <[email protected]> wrote: > A plant with 3X in gametic stage, would become hexaploid sporophytic phase > 2N=3X may generally result from a cross between a diploid and a tetraploid, > and would be sterile and perish soon, unless it multiplies vegetatively, or > else duplication of chromosomes occurs to make it hexaploid, a phenomenon > commonly seen in Senecio and Tragopogon. > > -- > Dr. Gurcharan Singh > Retired Associate Professor > SGTB Khalsa College, University of Delhi, Delhi-110007 > Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018. > Phone: 011-25518297 Mob: 9810359089 > http://people.du.ac.in/~singhg45/ > > On Sat, Sep 25, 2010 at 10:51 AM, Pankaj Kumar <[email protected]> > wrote: >> >> I imagine if it was a correction of addition. Anyways, just a >> querry...So you mean to say a plant with 3x chromosome is not a >> polyploid? >> Pankaj >> >> On Sat, Sep 25, 2010 at 9:30 PM, Gurcharan Singh <[email protected]> >> wrote: >> > Pankaj ji >> > A slight correction. Every plant has N (gametic) and 2N (sporophytic) >> > chromosomes. Every plant has basic number X, usually same for a genus. A >> > diploid would have 2N=2X, whereas a polyploid would have 2N=4X >> > (tetraploid), >> > 6X (hexaploid), 8X (octaploid), etc. Plant is known as polyploid and >> > phenomenon as polyploidy. >> > -- >> > Dr. Gurcharan Singh >> > Retired Associate Professor >> > SGTB Khalsa College, University of Delhi, Delhi-110007 >> > Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018. >> > Phone: 011-25518297 Mob: 9810359089 >> > http://people.du.ac.in/~singhg45/ >> > >> > >> > On Sat, Sep 25, 2010 at 6:59 AM, Pankaj Kumar <[email protected]> >> > wrote: >> >> >> >> Usually the chromosoe number is 2n or diploid, when an organism has >> >> more than two sets of chromosomes then they are called polyploid and >> >> the phenomena is called Polyploidy. >> >> It is not a very uncommon phenomena in plants. Highest polyploidy is >> >> found in ferns. Orchidaceae is supposed to be one group with high >> >> polyploidy too. >> >> Regards >> >> Pankaj >> >> >> >> >> >> >> >> On Sat, Sep 25, 2010 at 7:17 PM, promila chaturvedi >> >> <[email protected]> wrote: >> >> > Dear All, >> >> > I want to know what is Polyploid and Polyploidy. This is >> >> > usuall occurance in >> >> > Passifloras, but can bein other plants as well. >> >> > Promia >> >> >> >> >> >> >> >> -- >> >> *********************************************** >> >> "TAXONOMISTS GETTING EXTINCT AND SPECIES DATA DEFICIENT !!" >> >> >> >> >> >> Pankaj Kumar Ph.D. (Orchidaceae) >> >> Research Associate >> >> Greater Kailash Sacred Landscape Project >> >> Department of Habitat Ecology >> >> Wildlife Institute of India >> >> Post Box # 18 >> >> Dehradun - 248001, India >> > >> > >> > >> > >> > >> >> >> >> -- >> *********************************************** >> "TAXONOMISTS GETTING EXTINCT AND SPECIES DATA DEFICIENT !!" >> >> >> Pankaj Kumar Ph.D. (Orchidaceae) >> Research Associate >> Greater Kailash Sacred Landscape Project >> Department of Habitat Ecology >> Wildlife Institute of India >> Post Box # 18 >> Dehradun - 248001, India > > > > > -- *********************************************** "TAXONOMISTS GETTING EXTINCT AND SPECIES DATA DEFICIENT !!" Pankaj Kumar Ph.D. (Orchidaceae) Research Associate Greater Kailash Sacred Landscape Project Department of Habitat Ecology Wildlife Institute of India Post Box # 18 Dehradun - 248001, India
